Source details
- Original source
- The Decoder
- Published
- 2026-05-14
- Primary topic
- AI Security
Why it matters
Security incidents, misuse, safety controls, red teaming, cyber threats, and guardrail changes. Use the original source for the full report, then use the directory shortcuts below to compare the products and workflows the story points toward.
What happened
The UK's AI Security Institute has revised its estimate of how fast AI cyber capabilities are doubling—twice. First from eight months down to 4.7, and now Anthropic's Claude Mythos Preview and OpenAI's GPT-5.5 have blown past even that accelerated timeline. Mythos is the first model to clear all of AISI's attack simulations. Anthropic's head of red teaming, Logan Graham, warns, "Within a year, Mythos will probably look quite dumb." The article New Claude Mythos becomes the first AI model to clear all cyberattack simulations from Britain's AI safety agency appeared first on The Decoder .
What to do next
Read the source, then use the company and guide links to understand which vendors, tools, or workflows are most exposed.
The UK's AI Security Institute has revised its estimate of how fast AI cyber capabilities are doubling—twice. First from eight months down to 4.7, and now Anthropic's Claude Mythos Preview and OpenAI's GPT-5.5 have blown past even that accelerated timeline. Mythos is the first model to clear all of AISI's attack simulations. Anthropic's head of red teaming, Logan Graham, warns, "Within a year, Mythos will probably look quite dumb." The article New Claude Mythos becomes the first AI model to clear all cyberattack simulations from Britain's AI safety agency appeared first on The Decoder .
This AimostAll brief summarizes the linked source so readers can scan AI developments quickly and jump to the original reporting when needed.
